小米手环5 NFC 自定义NFC数据方法综述

结论：

方案1.小米手环5 NFC可以通过修改HTTPS的POST 数据来自定义NFC卡片的所有扇区数据；

方案2.先手环复制一张没有加密的实体门禁卡（实体门禁卡卡号要提前写成自己想要的卡号），并且启用，然后通过电脑+NFC读卡器（ACR122U）直接修改这张卡的数据。除去0扇区第0行外，其它所有数据都可以修改。因为0扇区第0行包含卡号、校验码和厂商码，所以小米手环不允许改。

着重介绍一下方案1：

方案1的实现：

可以借鉴我以前的小米手环3 NFC数据修改的方式借鉴电脑抓包和改包。https://www.cnblogs.com/storyline/articles/9986860.html

抓包改包软件很多，自行选择。

起作用的两个链接和请求体参数

第一个api和参数：

https://api-mifit-cn.huami.com/nfc/accessCard/script/init?r=A07A0065-DAC1-4C29-82DA-C30B664A37FA&t=1592767900198

Request Body为：

{ "fareCardType": 0, "fetch_adpu_mode": "SYNC", "product_sub_type": "", "sak": "08", "uid": "12345678", "aid": "", "atqa": "0400", "size": 1024, "action_type": "copyFareCard", "blockContent": "1234567870880400C08E3B50596010130000000000ABCDEFGH00000000000000000000000000000ABCDEFGH000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000000000000ABCDEFGH0000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff00000000000000000000000000000000000000000000000000000000000000000000000000000000ABCDEFGH00000000ffffffffffffff078069ffffffffffff00000000000000000000000000000000000000000000000000000000000000000000ABCDEFGH00000000000000000000ffffffffffffff078069ffffffffffff0000000000000000000000000000000ABCDEFGH000000000000000000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000ABCDEFGH0000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000000000000000ABCDEFGH0000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000000000000ABCDEFGH0000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000000000000000000000ABCDEFGH0000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000000000000ABCDEFGH0000000000000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000000000000ABCDEFGH00000000000000ABCDEFGH000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff000000000000000000ABCDEFGH0000000000000000000000000000000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff00000000000000ABCDEFGH00000000000000000000000000000000000000000000000000000000000000000000000000ffffffffffffff078069ffffffffffff00000000000000000000000000000ABCDEFGH00000000000000ABCDEFGH00000000000000000000000000ABCDEFGH000ffffffffffffff078069ffffffffffff"}

第二个api和参数：

https://api-mifit-cn.huami.com/nfc/accessCard/script/request?r=A07A0065-DAC1-4C29-82DA-C30B664A37FA&t=1592767901974

Request Body为：

{ "uid": "12345678", "fareCardType": 0, "product_sub_type": "", "blockContent": "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", "fetch_adpu_mode": "SYNC", "session": "3581-547405239-44086875137", "size": 1024, "atqa": "0400", "current_step": "1", "sak": "08", "command_results": {  "succeed": true,  "results": [   {    "result": "6F108408A000000151000000A5049F6501FF9000",    "checker": "^(9000|6283)$",    "command": "00A4040008A000000151000000",    "index": "1"   },   {    "result": "00009255039623302507200200275CA42AD7108E8096B4EE56DD62399000",    "checker": "^(9000)$",    "command": "8050200008691C3B013B3EED18",    "index": "2"   }  ] }, "aid": "", "action_type": "copyFareCard"}

你的任务：

首先手机处于被抓包的状态，然后点击复制门禁卡（需要未加密的门禁卡，后面的api才会被触发）

利用抓包和改包工具，在Request请求前，拦截这两个API请求，并修改这两个请求体的两个参数：uid和blockContent，最后复制成功后的卡就是你自定义的NFC数据了。

里面涉及较多电脑相关知识，无法做到一一解释，不懂可以问问百度。

安卓我不确定能不能抓包，安卓系统信任证书太严格了。iOS绝对有效，我写了一个thor脚本，会用thor的应该能明白怎么去自定义数据了。